. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Echinodermata. ,j^ will be seen that these tube feet are retracted, extended, and vanously moved about. For protection the feet can be withdrawn into the groove. But commonly the feet are applied to the surface on which the starfish is creep- wLr ^Z-'"''" '°°' I' " """'o* '=y""<''=^' containing water, and .s connected by a slender tube, passing be tween the ossicles, with a water bulb in the cavity of the 2\ T "" *°°' """^ *' '"'"' "" &qu
. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Echinodermata. ,j^ will be seen that these tube feet are retracted, extended, and vanously moved about. For protection the feet can be withdrawn into the groove. But commonly the feet are applied to the surface on which the starfish is creep- wLr ^Z-'"''" '°°' I' " """'o* '=y""<''=^' containing water, and .s connected by a slender tube, passing be tween the ossicles, with a water bulb in the cavity of the 2\ T "" *°°' """^ *' '"'"' "" "'^''^'- 'o when the bulb contracts ,t forces more water into the foot and Madreporic plate Stone canal. Radial canal Fig. 189. Watkr tube svsiem of Startoh. extends it; and when the foot shortens it can send the water back mto the bulb. Around the mouth is a circular rrancVr'f' "":.' ''"'' ' *"•" ="""« «-" -y: »<• "^e branches from these radiating tubes supply the tube feet. On the outside of the aboral surface, between the bases of two of the _ jhere is a wartlike body. This is the madreponc plate. It is perforated. Water enter, it and -aM^^^^'««Sll«^:^ •*- :"-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Colton, Buel P. (Buel Preston), 1852-1906. Toronto : Copp, Clark
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
